(6x^2-12^4)/3x^2
=6x^2/3x^2-12^4/3x^2
=2-4x^212^4/3x^2=4x^2是怎么来的约分采纳吧是12^4不是12x^4怎么约漏了x采纳吧可是题目上没有那个x不信拉倒